package com.hue.springcloud.lb.impl;

import com.hue.springcloud.lb.LoadBalanced;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

@Component
public class MyLoadBalanced implements LoadBalanced {
    private AtomicInteger atomicInteger=new AtomicInteger(0);

    public final int getAndIncrement(){
        int current;
        int next;
        do {
            current = this.atomicInteger.get();
            next = current>2147483647 ? 0:current+1;
        }while (!this.atomicInteger.compareAndSet(current,next));
        return next;
    }

    @Override
    public ServiceInstance getService(List<ServiceInstance> services) {
        int index = this.getAndIncrement()%services.size();
        return services.get(index);
    }
}
